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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 4, pp. 290-299

Submesoscale cyclonic eddy behind Cape Gvardeisky in the southeastern Baltic Sea: satellite observation and concurrent measurements

E.V. Krayushkin 1 , K.R. Nazirova 1 , O.Yu. Lavrova 1 , N.A. Knyazev 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 02.09.2020
DOI: 10.21046/2070-7401-2020-17-4-290-299
The results of concurrent satellite and boat observations of a submesoscale cyclonic eddy displayed in a Sentinel-2B MSI image behind Cape Gvardeisky (southeastern Baltic Sea) are presented. The eddy originated downstream of Cape Gvardeisky of the Sambian Peninsula by force of easterly winds that persisted for 3 days. This is a rare occasion as usually there occur anti-cyclonic eddies and dipoles due to mostly westerly winds. Joint analysis of the satellite data and fully synchronous measurements with an acoustic Doppler current profiler made it possible not only to estimate the horizontal dimensions of the eddy but also demonstrate that it spans the entire water column, from the surface to the bottom. Consecutive boat measurements with a time interval of about 7 h revealed the displacement of the eddy center at a velocity of 8.5 cm/sec. The eddy was displayed in the satellite image due to the presence of a tracer in the surface layer of water. In this case, it was an aggregation of cyanobacteria that was confirmed by probing with a chlorophyll a concentration meter inside and outside the eddy.
Keywords: submesoscale cyclonic eddy, currents behind capes, satellite observations, Sentinel-2 MSI, chlorophyll a concentration, concurrent measurements, acoustic Doppler current profiler, southeastern Baltic Sea
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